Dragracing

[TeufelHunden]

I’ve wondered if off-road+ makes a difference in launch performance. It definitely sounds great.

I was wondering same? Does off-road+ make jeep any quicker on the street?

 

[csa392]

I’ve wondered if off-road+ makes a difference in launch performance. It definitely sounds great.

It should change the shift points of the trans which may or may not be better. Only one way to find out. I know in the dunes with 4high part time it did.

 

[Viking Jeeper]

I was wondering same? Does off-road+ make jeep any quicker on the street?

Throttle response seems better but that can also be addressed with Pedal Commander.

One definite difference with off-road+ in my experience is hard shifts include the Hemi fart.

 

[Jeepstin392]

On my GC SRT, you could program the RPM launch. Factory was set at 2k. I was able to program it to 4500. Biiiig difference off the line.

can the JL 392 be programmed for different RPM’s?

 

[BenLandry]

On my GC SRT, you could program the RPM launch. Factory was set at 2k. I was able to program it to 4500. Biiiig difference off the line.

can the JL 392 be programmed for different RPM’s?

That might be a ZAutomotive question. I haven’t seen it in any setting but they may be able to map it.

 

[TeufelHunden]

Throttle response seems better but that can also be addressed with Pedal Commander.

One definite difference with off-road+ in my experience is hard shifts include the Hemi fart.

 

[hardhat]

Throttle response seems better but that can also be addressed with Pedal Commander.

One definite difference with off-road+ in my experience is hard shifts include the Hemi fart.

Agreed. I think the hemi fart in offroad + and paddle shifting is not good for performance. The AMAX shifts in regular torque reserve launch are much more positive.

Maybe can try offroad + torque reserve this morning on way to work.

Just did a regular 0-60 with torque reserve launch. Tazer read 4.45 seconds. Traffic did not permit comparison run. Really just need to take this thing to the dragstrip and beat on it a little Saturday night.

 

[hardhat]

So did some more runs this evening. 4.45 this am was 78 deg 1/4 tank reasonably flat I think. This afternoon low 5's full tank little uphill 90 degrees. Best run was 5.1 with trac control off, but again all of these were on highway coming home from work. Stopping as traffic would allow. There is a local 1/8 dragstrip that is having a "no prep" whatever that means night on saturday night. Old fashioned street races. No clocks. On some future Sat nights they will have the clocks up. Hopefully can take it this weekend and get some video and do some runs using tazer for timing and experiment with different settings and launches. Weather is uncertain so we'll see.

It is fun as HE11 doing these launches and timing them.
Nothing unsafe at all about it either. Launches straight and true and in 1/8 mile is only going to top out at 85 or so. Biggest danger would be car in other lane getting out of control.

Unless something happens, in coming weeks I will get video footage and run this thing on the 1/8 mile and get some ET's.

 

[hardhat]

So did some more runs this evening. 4.45 this am was 78 deg 1/4 tank reasonably flat I think. This afternoon low 5's full tank little uphill 90 degrees. Best run was 5.1 with trac control off, but again all of these were on highway coming home from work. Stopping as traffic would allow. There is a local 1/8 dragstrip that is having a "no prep" whatever that means night on saturday night. Old fashioned street races. No clocks. On some future Sat nights they will have the clocks up. Hopefully can take it this weekend and get some video and do some runs using tazer for timing and experiment with different settings and launches. Weather is uncertain so we'll see.

It is fun as HE11 doing these launches and timing them.
Nothing unsafe at all about it either. Launches straight and true and in 1/8 mile is only going to top out at 85 or so. Biggest danger would be car in other lane getting out of control.

Unless something happens, in coming weeks I will get video footage and run this thing on the 1/8 mile and get some ET's.

Did brake torque launch in offroad + mode.....Interesting results. Jeep did not go into the torque reserve mode while brake torquing, BUT after launching, it did the AMAX shifts (no fart on shifting).

I get a little wheelspin on the torque reserve launches and the trac light comes on. I think this hurts performance a little. I didn't do a 0-60 on this one......I was just doing the off road + thing in the parking lot going to pick up my daughter from cheer practice. So leaving I did the launch. Was wanting it to fart on the shift as usual, but this could be an interesting development and might be the quickest 0-60. Will have to do more research. Hopefully more of us can get to a track and report back.

On another note, as fun as all this is, how "bad" do you think it is for the jeep, or is the powertrain tough enough to handle a little playing around with no ill effects? I really drive mine pretty easy most of the time and have just started doing more of the launches in different ways just out of curiosity, but it is ridiculous fun.

 

[KungFu392]

On another note, as fun as all this is, how "bad" do you think it is for the jeep, or is the powertrain tough enough to handle a little playing around with no ill effects? I really drive mine pretty easy most of the time and have just started doing more of the launches in different ways just out of curiosity, but it is ridiculous fun.

I'd like to believe that these things are overbuilt to handle a little on road fun like this. Obviously, shocking the driveline can have ill effects, but as long as you are just torquing it up with the driveline engaged and then just accellerating hard and letting the auto trans TCM and ECM control the shifts, I suspect it won't grenade itself. I suggest you keep trying and find out for all of us.

 

[hardhat]

I'd like to believe that these things are overbuilt to handle a little on road fun like this. Obviously, shocking the driveline can have ill effects, but as long as you are just torquing it up with the driveline engaged and then just accellerating hard and letting the auto trans TCM and ECM control the shifts, I suspect it won't grenade itself. I suggest you keep trying and find out for all of us.

That is my thought too. I'm not doing anything beyond what is described in the performance manual when it comes to launches. I'm definitely going to make my way to the local 1/8 mile strip and make some passes.

 

[KungFu392]

That is my thought too. I'm not doing anything beyond what is described in the performance manual when it comes to launches. I'm definitely going to make my way to the local 1/8 mile strip and make some passes.

I can't wait to see the video of that! I haven't been to the dragstrip in way longer than I care to admit. I never even got my Hellcat or the GC SRT out. Just don't have time in my crazy busy life these days, but I am super curious how these bad boys measure up to the "pony car" crew.

 

[BenLandry]

I can't wait to see the video of that! I haven't been to the dragstrip in way longer than I care to admit. I never even got my Hellcat or the GC SRT out. Just don't have time in my crazy busy life these days, but I am super curious how these bad boys measure up to the "pony car" crew.

This was pretty entertaining. He’s got several videos drag racing his completely stock 392

 

[hardhat]

I can't wait to see the video of that! I haven't been to the dragstrip in way longer than I care to admit. I never even got my Hellcat or the GC SRT out. Just don't have time in my crazy busy life these days, but I am super curious how these bad boys measure up to the "pony car" crew.

I think the 1/8 mile is probably where the 392 will shine. 1/4 limited by aerodynamics.
Racing from a dead stop favors the 392 over rear wheel drive cars. The AWD diminishes the amount of skill needed for a good launch. I think if I drag some stockish Mustangs and Camaros, they may end up seeing my tailights if they don't get a good launch.
Longer races would favor the more aerodynamic vehicles.

Jeep Wrangler Rubicon 392 V8 specs, 0-60, quarter mile, lap times - FastestLaps.com

2021 Jeep Wrangler Rubicon 392 V8 specs, 0-60, quarter mile, lap times, price, engine specifications, pictures, updated September 2022.

fastestlaps.com

You can hover over the time in seconds down on the page and it will show you other vehicles in that range.

0-30 in 1.4 seconds puts the jeep in very good company. Right up there with Ferrari Enzo (1.3), but after the Ferrari hooks up it is game over for the jeep.

 

[Tejas392]

I honestly hope these supercars perform better, but it is awesome that we can shock the hell out of them at stop lights if given the opportunity!

 

[hardhat]

I honestly hope these supercars perform better, but it is awesome that we can shock the hell out of them at stop lights if given the opportunity!

First run on of the night, I took out a corvette. The announcer said, "Did you see that Jeep beat that corvette?"

Only timeslip I got was 8.566 with no mph. They just had the start and finish light going, I had to go to booth to ask for timeslip. They were not reporting mph, 60ft etc. Was pretty much street race night.

0-60 on tazer was very consistent in different modes. Full tank of gas low 80's and very high humidity. 0-60 was 4.92 - 5.04 on all runs.

 

[Rscx4]

This is exactly why I own a 392. As a motorhead, performance always matters, and to be able to take it anywhere… beach, dunes, deep woods, mud, literally anywhere. I love this thing.

 

[Viking Jeeper]

0-60 on tazer was very consistent in different modes. Full tank of gas low 80's and very high humidity. 0-60 was 4.92 - 5.04 on all runs.

with 4.56 gears I thought the expected 0-60 is closer to 4.0 seconds

 

[hardhat]

with 4.56 gears I thought the expected 0-60 is closer to 4.0 seconds

That is what c&d got. Mine has a winch. Bunch of tools in it. Rock rails. Less than ideal conditions. Don’t know how all that affects it. Not sure how accurate tazer is. Mine may be slower than average. Don’t know.